At the end of February, Sessionk was announced, a new component that's capable of allowing the KDE Plasma desktop to start-up a heck of a lot faster.
In a lengthy blog post, Daniel Nicoletti describes his experimental work on Sessionk. His post goes on to explain narrowing down what's taking the KDE desktop so long to load and what he's done to improve the situation with his new Sessionk project.
The blog post is worth reading for KDE users that are looking for their desktop to load faster.
He's been able to get the KDE Plasma desktop to load in three seconds, rather than 10+ seconds:
He can get the full KDE Plasma desktop going in about seven seconds:
Also using Sessionk, he can get the Qt-based Razor-qt desktop to load in approximately four seconds: